From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH]QNX6 filesystem (RO) driver
Date: Wed, 15 Feb 2012 07:11:19 +0000
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Cc: linux-fsdevel@vger.kernel.org
To: Kai Bankett <chaosman@ontika.net>
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On Wed, Feb 15, 2012 at 06:47:28AM +0000, Al Viro wrote:
> On Wed, Feb 15, 2012 at 06:10:12AM +0000, Al Viro wrote:
> 
> [snip]
> 
> OK, I've dumped something that compiles in #qnx6 in vfs.git; I don't promise
> anything beyond that - consider that as slightly more elaborate variant of
> the previous mail.  At that stage I would definitely prefer to see fixes,
> etc. *folded* into the patch before it gets merged, so do not treat that
> branch as anything other than convenient (for me) way to post a series of
> incrementals.
> 
> Oh, and the final result will obviously need s-o-b by Kai + sane commit
> message, etc.

If you prefer to test on top of -stable, just copy d_make_root() from
current mainline into fs/dcache.c and export it - that's the only dependency
on the stuff from the last merge window.  Or just open-code the sucker
into your fill_super...

One more thing - unless I'm misreading the code it looks like your ->sb becomes
a dangling pointer once fill_super finishes and ->statfs() is dereferencing
it...